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from fastapi import APIRouter, HTTPException, Request
from fastapi.responses import StreamingResponse
from schemas.openai import CreateCompletionRequest, CreateCompletionResponse

router = APIRouter()


@router.post(
    "/v1/completions", response_model=CreateCompletionResponse, tags=["Completions"]
)
async def create_completion(
    request: CreateCompletionRequest, raw_request: Request
) -> CreateCompletionResponse | StreamingResponse:
    """
    Creates a completion for the provided prompt and parameters.
    """
    if not raw_request.app.engine:
        raise HTTPException(status_code=500, detail="No attached inference engine")

    try:
        response = await raw_request.app.engine.completion(request)
        if request.stream:
            return StreamingResponse(response, media_type="text/event-stream")
        return response
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"{e}")
